Air purifier



FIG. 1 is a perspective view of an air purifier showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left elevational view thereof;

FIG. 4 is a right elevational view thereof;

FIG. 5 is a back elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a vertical cross sectional view thereof as seen along section line 8-8 of FIG. 6. 

CLAIM The ornamental design for an air purifier, as shown and described. 